I dunno if the 319 would float. seems like it'd be heavy enough to displace more than the inch of bottom lip that curves up. Soon as it dipped below the carriage cutouts on the sides, it'd sink like a rock. glugglug...

My personal beach Typer is a Royal Mercury. Like your's, it has a clamshell case and beige color - that must be the official beach Typer color scheme!

I found for dealing with the wind to take a large bulldog clip and attach it to the top of your paper, it provides enough weight to keep the paper from flapping around in all but the heartiest gale, at which point one should probably head indoors.